Sewing – Elements – Thread sensing
Patent
1979-09-17
1980-12-09
Nerbun, Peter P.
Sewing
Elements
Thread sensing
112273, 250571, 139273A, G01B 712, D05B 6936
Patent
active
042378079
ABSTRACT:
A thread monitoring device for monitoring the thread supply in a sewing machine, having a rotary hook, comprises, a hook body with a thread bobbin having thread thereon which is connected to a rotatable shaft for rotation thereby. The hook includes a stationary bobbin case which is enclosed by a hook body which has a hub portion connected to the shaft. A light source is disposed on one side of the hook and a light receiver is disposed on the opposite side. Light is transmitted by the light source through a path intercepting the thread on the bobbin so that, when the thread on the bobbin is paid out during the stitching operation, beyond a predetermined amount, the light will be transmitted to a reflective wall portion of the hook body and deflected by the wall portion to the light receiver. The light receiver is connected in a control circuit to operate a control for operating the sewing machine or for actuating an indicator to show that the thread has been used up to the predetermined amount.
REFERENCES:
patent: 3082968 (1963-03-01), Reichelt et al.
patent: 3599586 (1971-08-01), Newman
patent: 3845320 (1974-10-01), Winberg
Kemmel Patrice
Meier Gunter
Dorina Nahmaschinen GmbH
Nerbun Peter P.
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